Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 99,148	$ 92,825
Less: Accumulated depreciation	59,538	57,435
Property, plant and equipment, net	39,610	35,390
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	964	995
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	15,805	15,365
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 82,379	$ 76,465